API Decoding Struct Swift

Question

Hello I'm trying to decode this API, https://gorest.co.in/public-api/posts. What I'm doing wrong with structs? Thank you.

struct Root: Decodable {
let first: [Code]
let second: [Meta]
let third: [Post] } 

struct Code: Decodable {
    let code: Int
}

struct Meta: Decodable {
    let meta: [Pagination]
}

struct Pagination: Decodable {
    let total: Int
    let pages: Int
    let page: Int
    let limit: Int
}

struct Post: Decodable {
    let id: Int
    let user_id: Int
    let title: String
    let body: String
}

Your struct doesn't match the JSON. Make them Codable instead of Decodable only, and do let root = Root(first..., ie create an instance, and use JSONEncoder() to see what's the "compatible" JSON with your struct. You'll see... — Larme
– Larme, Commented Jul 18, 2022 at 11:10
No it's not. The response parameter is from the API. What is PostPresenter supposed to represent? — Daniel T.
– Daniel T., Commented Jul 18, 2022 at 12:51

Daniel T. · Accepted Answer · 2022-07-18 11:15:15Z

2

Quicktype.io is your friend. Post the JSON to it and get the struct back automatically.

// This file was generated from JSON Schema using quicktype, do not modify it directly.
// To parse the JSON, add this file to your project and do:
//
//   let root = try? newJSONDecoder().decode(Root.self, from: jsonData)

import Foundation

// MARK: - Root
struct Root: Codable {
    let code: Int
    let meta: Meta
    let data: [Datum]
}

// MARK: - Datum
struct Datum: Codable {
    let id, userID: Int
    let title, body: String

    enum CodingKeys: String, CodingKey {
        case id
        case userID = "user_id"
        case title, body
    }
}

// MARK: - Meta
struct Meta: Codable {
    let pagination: Pagination
}

// MARK: - Pagination
struct Pagination: Codable {
    let total, pages, page, limit: Int
}

answered Jul 18, 2022 at 11:15

Daniel T.

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4 Comments

georgekak Over a year ago

Cannot assign value of type '[Datum]' to type 'String' is the error for the datum. I am trying to solve it. The last one before the successful run

Daniel T. Over a year ago

What is the URL that causes that error? The one you provided does not.

georgekak Over a year ago

I refresh the question. Take a look. thanks.

Daniel T. Over a year ago

Your title var is a String, the data is not a String. It's an array of Datum objects.

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